The truth is that there are many products out there that aren't much different than what you will find in the pro line or automagic, etc. Basically bulk, generic detailing products for the most part. Let's face it, there are not that many manufacturer's out there so private labeling screaming behind the scenes.
I don't see TOLL PROCESSING to be very popular in this industry. You see that a lot in say the food and beverage industry. For example, BUD doesn't care about SAM ADAMS recipe because they each have their "taste" that are set apart by the drinkers preference. In the detailing industry, products are benchmarked by performance, so why would someone give up a killer recipe to a competitor??
Anyone that has ever been to a chemical plant (I've worked in several) will know that the most cost effective way of private labeling would be to simply rebottle the product. Often additives are added (color, fragrance,etc) towards the end of the batch to yield some uniqueness. If anything, the basic process remains the same (expensive to change the steps), and alternate ingredients are substituted under the customers (vendors) direction. Since batch sizes are typically very large, a manufacturer will only do thiscost effectively on large orders. The finished product is typically shipped from the manufacturer to the distributors directly (why send them to the middle man and ship them twice?) so the distributors probably know where the products are coming from.
When developing a product, cost is a major concern and usually the limiting factor. Most products can probably be made to perform better, but who will buy them at the price they cost to produce?
The sad thing is that this whole industry revolves around marketing. AFter all EVERY product out there is the longest lasting, deepest shining product out there OR YOUR MONEY BACK!!!
When comparing products, it is interesting to note similarities between products X and Y, but even better, it is interesting to note the differences. Now the question is ........do those difference justify the difference in pricing?